Ngc 6888 ( Felliscopio )

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent nebula · NGC 6888

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Ngc 6888

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Ngc 6888

Imaging Telescopes Or Lenses: SkyWatcher Esprit 150 ED APO Triplet
Imaging Cameras: ATIK 4000
Mounts: EQ8
Filters: Ha 12nm · Baader Planetarium Ha 7nm · OIII
Guiding Telescopes Or Lenses: ED80
Guiding Cameras: QHYCCD QHY5L-II M

Dates:: Oct. 29, 2014 · Oct. 30, 2014
Frames:: Baader Planetarium Ha 7nm: 13×900″(3h 15′) -15°C bin 1×1
OIII: 15×1200″(5h) -15°C bin 1×1
Integration:: 8h 15′
Avg. Moon age:: 6.19 days
Avg. Moon phase:: 37.53%

Basic astrometry details

Astrometry.net job: 516518

RA center: 20h12m09s.4

DEC center: +38°20′56″

Pixel scale: 1.408 arcsec/pixel

Orientation: 145.537 degrees

Field radius: 0.553 degrees

Resolution: 1997x2001

File size: 3.2 MB

NGC 6888 (nota anche come Nebulosa Crescente) è una nebulosa diffusa visibile nella parte meridionale della costellazione del Cigno.

La nube risplende per riflessione, a seguito dell'energia ricevuta durante l'esplosione della stessa supernova.

I gas della nebulosa appaiono centrati su una stella di Wolf-Rayet (HD 192163), che si trova ora al suo interno; questa stella sarebbe anche la responsabile della nebulosa, che costituirebbe il materiale degli strati più esterni della stella espulsi, che avrebbero poi colliso con altre nebulose creando così la forma che si osserva. Secondo altri studi si tratterebbe invece di un resto di supernova la cui stella progenitrice faceva parte del sistema di HD 192163. La nebulosa si estende nello spazio per una dimensione di circa 16 anni luce.

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Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Dismissals Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Basic success
Started	...
Astrometry.net job	516518
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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